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Message-ID: <DM8PR11MB5751217E922FE7CC4D58646CB8F52@DM8PR11MB5751.namprd11.prod.outlook.com>
Date: Fri, 24 May 2024 02:29:43 +0000
From: "Wang, Xiao W" <xiao.w.wang@...el.com>
To: Björn Töpel <bjorn@...nel.org>,
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<xi.wang@...il.com>
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<pulehui@...wei.com>, "Li, Haicheng" <haicheng.li@...el.com>
Subject: RE: [PATCH] riscv, bpf: Introduce shift add helper with Zba
optimization
> -----Original Message-----
> From: Björn Töpel <bjorn@...nel.org>
> Sent: Wednesday, May 22, 2024 12:40 AM
> To: Wang, Xiao W <xiao.w.wang@...el.com>; paul.walmsley@...ive.com;
> palmer@...belt.com; aou@...s.berkeley.edu; luke.r.nels@...il.com;
> xi.wang@...il.com
> Cc: ast@...nel.org; daniel@...earbox.net; andrii@...nel.org;
> martin.lau@...ux.dev; eddyz87@...il.com; song@...nel.org;
> yonghong.song@...ux.dev; john.fastabend@...il.com; kpsingh@...nel.org;
> sdf@...gle.com; haoluo@...gle.com; jolsa@...nel.org; linux-
> riscv@...ts.infradead.org; linux-kernel@...r.kernel.org; bpf@...r.kernel.org;
> pulehui@...wei.com; Li, Haicheng <haicheng.li@...el.com>; Wang, Xiao W
> <xiao.w.wang@...el.com>
> Subject: Re: [PATCH] riscv, bpf: Introduce shift add helper with Zba
> optimization
>
> Xiao Wang <xiao.w.wang@...el.com> writes:
>
> > Zba extension is very useful for generating addresses that index into array
> > of basic data types. This patch introduces sh2add and sh3add helpers for
> > RV32 and RV64 respectively, to accelerate pointer array addressing.
> >
> > Signed-off-by: Xiao Wang <xiao.w.wang@...el.com>
>
> This is dependent on [1], and given it hasn't been accepted yet, I'd
> make this patch part of that series.
I would make a new version, combining them as a series. Meanwhile
this patch needs rebase on top of bpf-next and enable one more sh3add
use cases.
BRs,
Xiao
>
>
> Björn
>
> [1] https://lore.kernel.org/linux-riscv/20240516090430.493122-1-
> xiao.w.wang@...el.com/
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